Model 3231 USB

OEM External Pulse Oximeter

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Model 3231 USB

OEM External Pulse Oximeter

The Nonin Model 3231 USB is a high-performing OEM pulse oximeter that provides SpO2 and pulse rate spot-check monitoring. A convenient USB connection allows easy data transfer to a computer.


Fast Readings

Quickly provides accurate SpO2 and pulse rate readings from small to large fingers, good to low perfusion, and dark to light skin tones


Easy Integration

Easily integrates into most telemedicine hubs via USB port


Long Battery Life

Provides up to 2,200 spot checks on two AAA batteries

Accuracy in a Wide Range of Patients

Dependable accuracy in the widest range of patient populations and settings, so you can provide one device for your clients

CorrectCheck Technology

Proprietary CorrectCheck technology gives feedback when the finger is not placed properly in the device

Easy to Read

Large patient facing display makes getting readings quick and simple

SmartPoint Sync Feature

Indicates when the oximeter is syncing with the hub; user can remove oximeter after sync is complete

SmartPoint Capture and Send Technology

The SmartPoint algorithm determines when a high quality measurement is ready to be transmitted, and includes an indicator of quality

PureSAT® Technology

Only Nonin oximeters use PureSAT® SpO2 technology, which allows for pulse-by-pulse readings that can capture events such as rapid desaturation

Pulse Amplitude Strength Reporting

Provides pulse amplitude index number in the data stream—no need to calculate your own number

Automatic On and Off

Automatic power switching for ease of use and extended battery life; provides up to 2,200 spot checks on two AAA batteries

Proven Durability and Quality

Protects against dropping and water spills, backed by a 2-year warranty

Your Partner
of Choice

With more than 30 years of experience and dedication to the design and support of noninvasive monitoring devices, Nonin has helped many medical professionals meet clinical and economic objectives. More than 300 OEM partners around the world rely on Nonin technology to successfully integrate superior pulse oximetry and capnography into their products.

PureSAT® Technology
Clinically Proven

Nonin PureSAT technology uses intelligent pulse-by-pulse filtering to provide fast, precise oximetry measurements—even in the presence of SpO2 changes, poor peripheral blood circulations, motion, and other challenging conditions.

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